supervisory circuits with watchdog and manual reset in 5-lead sc70 & sot-23 preliminary technical data adm823Cadm825 rev. pra information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent ri ghts of analog devices. trademarks and registered trademarks are the proper ty of their respective companies. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.326.8703 ? 2004 analog devices, inc. all rights reserved. features precision 2.5v to 5v power supply monitor 7 reset threshold options: 2.19v to 4.63v 140ms (min) reset timeout watchdog timer with 1.6s timeout (adm823, adm824) manual reset input (adm823, adm825) push-pull output stages reset (adm823) reset , reset (adm824/adm825) low power consumption (3a) guaranteed reset output valid to v cc =1v power supply glitch immunity specified over industrial temperature range 5-lead sc70 and sot-23 packages applications microprocessor systems computers controllers intelligent instruments portable equipment general description the adm823-adm825 are supervisory circuits which monitor power supply voltage levels and code execution integrity in microprocessor-based systems. as well as providing power on reset signals, an on-chip watchdog timer can reset the microprocessor if it fails to strobe within a preset timeout period. a reset signal can also be asserted by means of an external push-button, through a manual reset input. the three parts feature different combinations of watchdog input, manual reset input and output stage configuration, as shown in table 1. functional block diagram
each part is available in a choice of 7 reset threshold options ranging from 2.19v to 4.63v. the reset and watchdog timeout periods are fixed at 140ms (min) and 1.6s (typ), respectively. the adm823-adm825 are availabl e in 5-lead sc70 and sot-23 packages and typically consume only 3a, making them suitable for use in low power portable applications . table 1. selection table output stage part no. watchdog timer manual reset reset reset adm823 yes yes push-pull - adm824 yes - push-pull push-pull adm825 - yes push-pull push-pull
adm823Cadm825 preliminary technical data rev.pra | page 2 of 7 adm823-adm825specifications table 2. v cc =4.75v to 5.5v for adm82_l, v cc =4.5v to 5.5v for adm82_m, v cc =3.15v to 3.6v for adm82_t, v cc =3v to 3.6v for adm82_s, v cc =2.7v to 3.6v for adm82_r, v cc =2.38v to 2.75v for adm82_z, v cc =2.25v to 2.75v for adm82_y, t a =t min to t max , unless otherwise noted parameter min typ max units test conditions/comments supply v cc operating voltage range 1 5.5 v t a =0c to +70c 1.2 v t a =t min to t max supply current (sot-23 only) 10 24 a wdi and mr unconnected adm823l/m, adm824l/m 5 12 a wdi and mr unconnected adm823t/s/r/z/y, adm824t/s/r/z/y 4.5 12 a mr unconnected adm825l/m 3 8 a mr unconnected adm825t/s/r/z/y supply current (sc70 only) 6 17 a wdi and mr unconnected adm823l/m, adm824l/m 4 12 a wdi and mr unconnected adm823t/s/r/z/y, adm824t/s/r/z/y 3 8 a mr unconnected adm825l/m 2 6 a mr unconnected adm825t/s/r/z/y reset threshold voltage adm82_l 4.56 4.63 4.70 v t a =+25c 4.50 4.75 v t a =t min to t max adm82_m 4.31 4.38 4.45 v t a =+25c 4.25 4.50 v t a =t min to t max adm82_t 3.04 3.08 3.11 v t a =+25c 3.00 3.15 v t a =t min to t max adm82_s 2.89 2.93 2.96 v t a =+25c 2.85 3.00 v t a =t min to t max adm82_r 2.59 2.63 2.66 v t a =+25c 2.55 2.70 v t a =t min to t max adm82_z (sc70 only) 2.28 2.32 2.35 v t a =+25c 2.25 2.38 v t a =t min to t max adm82_y (sc70 only) 2.16 2.19 2.22 v t a =+25c 2.13 2.25 v t a =t min to t max reset threshold temperature coefficient 40 ppm/c reset threshold hysteresis 10 mv adm82_l/m 5 mv adm82_t/s/r/z/y reset timeout period 140 200 280 ms v cc to reset delay 40 s v th -v cc =100mv reset output voltage 0.4 v v cc =v th min, i sink =3.2ma, adm82_l/m 0.3 v v cc =v th min, i sink =1.2ma, adm82_t/s/r/z/y 0.3 v t a =0c to +70c, v cc =1v, v cc falling, i sink =50a v cc -1.5 v v cc =v th max, i source =120a, adm82_l/m
preliminary technical data adm823Cadm825 rev.pra | page 3 of 7 parameter min typ max units test conditions/comments 0.8 v cc v v cc =v th max, i source =30a, adm82_t/s/r/z/y reset output short circuit current 800 a reset =0v, v cc =5.5v, adm82_l/m 400 a reset =0v, v cc =5.5v, adm82_t/s/r/z/y reset output voltage 0.4 v v cc =v th max, i sink =3.2ma, adm824l/m, adm825l/m 0.3 v v cc =v th max, i sink =1.2ma, adm824t/s/r/z/y, adm825t/s/r/z/y 0.8 v cc v v cc >=1.8v, i source =150a watchdog input (adm823, adm824) watchdog timeout period 1.12 1.6 2.40 s wdi pulse width 50 ns v il =0.4v, v ih =0.8 v cc , wdi input threshold v il 0.3xv cc v v ih 0.7xv cc v wdi input current 120 160 a v wdi = v cc , time average -20 -15 a v wdi =0, time average manual reset input (adm823, adm825) mr input threshold 0.3xv cc v 0.7xv cc v mr input pulse width 1 s mr glitch rejection 100 ns mr pull-up resistance 35 52 75 k mr to reset delay 500 ns absolute maximum ratings table 3. t a = 25c unless otherwise noted. parameter rating v cc -0.3v to +6v output current (reset, reset ) 20ma operating temperature range sc70 -40c to +85c sot-23 -40c to +125c storage temperature range -65c to +150c ja thermal impedance sc70 146c/w sot-23 270c/w lead temperature soldering (10 sec) 300c vapour phase (60 sec) 215c infrared (15 sec) 220c stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability.
adm823Cadm825 preliminary technical data rev.pra | page 4 of 7 pin configurations and functional descriptions
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table 4. pin functional descriptions pin no. name description 1 reset push-pull active-low reset output, which is asserted whenever v cc is below the reset.threshold, v th . 2 gnd ground 3 mr (adm823) manual reset input. this is an active-low in put which, when forced low for at least 1s, generates a reset. features a 52k internal pull-up. reset (adm824/adm825) active-high, push-pull reset output. 4 wdi (adm823/adm824) watchdog input. generates a reset if the volt age on the pin remains low or high for the duration of the watchdog timeout. the timer is cleared if a logic transi tion occurs on this pin or if a reset is generated. mr (adm825) manual reset input. 5 v cc power supply voltage being monitored esd caution ` esd (electrostatic discharge) sensitive device. electrosta tic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge with out detection. although this product features proprietary esd protection circuitry, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality.
preliminary technical data adm823Cadm825 rev. pra | page 5 of 7 ordering guide (adm823, adm824) model reset threshold (v) temperature range quantity package type branding adm823laks-rl 4.63 -40c to +85c 10k sc70-5 n07 adm823laks-r7 4.63 -40c to +85c 3k sc70-5 n07 adm823lart-rl 4.63 -40c to +125c 10k sot-23-5 n07 adm823lart-r7 4.63 -40c to +125c 3k sot-23-5 n07 adm823maks-rl 4.38 -40c to +85c 10k sc70-5 n07 adm823maks-r7 4.38 -40c to +85c 3k sc70-5 n07 adm823mart-rl 4.38 -40c to +125c 10k sot-23-5 n07 adm823mart-r7 4.38 -40c to +125c 3k sot-23-5 n07 adm823taks-rl 3.08 -40c to +85c 10k sc70-5 n07 adm823taks-r7 3.08 -40c to +85c 3k sc70-5 n07 adm823tart-rl 3.08 -40c to +125c 10k sot-23-5 n07 adm823tart-r7 3.08 -40c to +125c 3k sot-23-5 n07 adm823saks-rl 2.93 -40c to +85c 10k sc70-5 n07 adm823saks-r7 2.93 -40c to +85c 3k sc70-5 n07 adm823sart-rl 2.93 -40c to +125c 10k sot-23-5 n07 adm823sart-r7 2.93 -40c to +125c 3k sot-23-5 n07 adm823raks-rl 2.63 -40c to +85c 10k sc70-5 n07 adm823raks-r7 2.63 -40c to +85c 3k sc70-5 n07 adm823rart-rl 2.63 -40c to +125c 10k sot-23-5 n07 adm823rart-r7 2.63 -40c to +125c 3k sot-23-5 n07 adm823zaks-rl 2.32 -40c to +85c 10k sc70-5 n07 adm823zaks-r7 2.32 -40c to +85c 3k sc70-5 n07 adm823yaks-rl 2.19 -40c to +85c 10k sc70-5 n07 adm823yaks-r7 2.19 -40c to +85c 3k sc70-5 n07 adm824laks-rl 4.63 -40c to +85c 10k sc70-5 n08 adm824laks-r7 4.63 -40c to +85c 3k sc70-5 n08 adm824lart-rl 4.63 -40c to +125c 10k sot-23-5 n08 adm824lart-r7 4.63 -40c to +125c 3k sot-23-5 n08 adm824maks-rl 4.38 -40c to +85c 10k sc70-5 n08 adm824maks-r7 4.38 -40c to +85c 3k sc70-5 n08 adm824mart-rl 4.38 -40c to +125c 10k sot-23-5 n08 adm824mart-r7 4.38 -40c to +125c 3k sot-23-5 n08 adm824taks-rl 3.08 -40c to +85c 10k sc70-5 n08 adm824taks-r7 3.08 -40c to +85c 3k sc70-5 n08 adm824tart-rl 3.08 -40c to +125c 10k sot-23-5 n08 adm824tart-r7 3.08 -40c to +125c 3k sot-23-5 n08 adm824saks-rl 2.93 -40c to +85c 10k sc70-5 n08 adm824saks-r7 2.93 -40c to +85c 3k sc70-5 n08 adm824sart-rl 2.93 -40c to +125c 10k sot-23-5 n08 adm824sart-r7 2.93 -40c to +125c 3k sot-23-5 n08 adm824raks-rl 2.63 -40c to +85c 10k sc70-5 n08 adm824raks-r7 2.63 -40c to +85c 3k sc70-5 n08 adm824rart-rl 2.63 -40c to +125c 10k sot-23-5 n08 adm824rart-r7 2.63 -40c to +125c 3k sot-23-5 n08 ADM824ZAKS-RL 2.32 -40c to +85c 10k sc70-5 n08 adm824zaks-r7 2.32 -40c to +85c 3k sc70-5 n08 adm824yaks-rl 2.19 -40c to +85c 10k sc70-5 n08 adm824yaks-r7 2.19 -40c to +85c 3k sc70-5 n08
adm823Cadm825 preliminary technical data rev.pra | page 6 of 7 ordering guide (adm825) model reset threshold (v) temperature range quantity package type branding adm825laks-rl 4.63 -40c to +85c 10k sc70-5 n09 adm825laks-r7 4.63 -40c to +85c 3k sc70-5 n09 adm825lart-rl 4.63 -40c to +125c 10k sot-23-5 n09 adm825lart-r7 4.63 -40c to +125c 3k sot-23-5 n09 adm825maks-rl 4.38 -40c to +85c 10k sc70-5 n09 adm825maks-r7 4.38 -40c to +85c 3k sc70-5 n09 adm825mart-rl 4.38 -40c to +125c 10k sot-23-5 n09 adm825mart-r7 4.38 -40c to +125c 3k sot-23-5 n09 adm825taks-rl 3.08 -40c to +85c 10k sc70-5 n09 adm825taks-r7 3.08 -40c to +85c 3k sc70-5 n09 adm825tart-rl 3.08 -40c to +125c 10k sot-23-5 n09 adm825tart-r7 3.08 -40c to +125c 3k sot-23-5 n09 adm825saks-rl 2.93 -40c to +85c 10k sc70-5 n09 adm825saks-r7 2.93 -40c to +85c 3k sc70-5 n09 adm825sart-rl 2.93 -40c to +125c 10k sot-23-5 n09 adm825sart-r7 2.93 -40c to +125c 3k sot-23-5 n09 adm825raks-rl 2.63 -40c to +85c 10k sc70-5 n09 adm825raks-r7 2.63 -40c to +85c 3k sc70-5 n09 adm825rart-rl 2.63 -40c to +125c 10k sot-23-5 n09 adm825rart-r7 2.63 -40c to +125c 3k sot-23-5 n09 adm825zaks-rl 2.32 -40c to +85c 10k sc70-5 n09 adm825zaks-r7 2.32 -40c to +85c 3k sc70-5 n09 adm825yaks-rl 2.19 -40c to +85c 10k sc70-5 n09 adm825yaks-r7 2.19 -40c to +85c 3k sc70-5 n09
preliminary technical data adm823?adm825 rev. pra | page 7 of 7 outline dimensions 0.087 (2.20) 0.071 (1.80 ) pin 1 0.094 (2.40) 0.071 (1.80) 0.051 (1.30) bsc 0.026 (0.65) bsc 1 3 4 2 0.053 (1.35) 0.045 (1.15) 0.004 (0.10) 0.004 (0.10) 8 0.012 (0.30) 0.006 (0.15) 0.004 (0.10) 0.000 (0.00) 0.039 (1.00) 0.031 (0.80) seating plane 0.043 (1.10) 0.031 (0.80) 0.007 (0.18) 0.012 (0.30) 0 5 figure 1. 5-lead plastic surface mount package [sc-70] (ks-5) dimensions shown in millimeters pin 1 1.60 bsc 2.80 bsc 1.90 bsc 0.95 bsc 1 3 4 5 2 0.22 0.08 10 5 0 0.50 0.3 0.15 max seating plane 1.45 max 1.30 1.15 0.90 2.90 bsc 0. 0.45 0.3 compliant to jedec standards mo-178aa figure 1. 5-lead small outline transistor package [sot-23] (rt-5) dimensions shown in millimeters 200 nalog deices nc. ll rights resered. trademarks and registered trademarks are the roer t of their resectie comanies. printed in the .s..
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